| Hymenostomatia |
a subclass of chiefly freshwater, ciliate protozoa (class Oligohymenophorea, phylum Ciliophora) with uniform, heavy body ciliature and a ventral buccal cavity when one is present; if kinetodesmata are present, they are usually conspicuous. It comprises three orders: Hymenostomatida, Scuticociliatida, and Astomatida.
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| Hymenostomatida |
an order of ciliate protozoa (subclass Hymenostomatia, class Oligohymenophorea) characterized by the presence of a well-defined buccal cavity containing membranelles or peniculi with infraciliary bases typically three to four rows of kinetosomes wide; and by a ventral oral area, usually in the anterior half of the body. It comprises three suborders: Tetrahymenina, Ophryoglenina, and Peniculina.
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| hymenotomy |
surgical incision of the hymen.
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| hymenovin |
a toxic lactone that is the active principle in species of Hymenoxys and causes gastroenteritis in cattle and sheep.
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| Hymenoxys |
a genus of herbs found in North America; some species contain the lactone hymenovin, which causes gastroenteritis and vomiting in cattle and sheep. Two common poisonous species are H. odora´ta, the bitterweed, and H. richardso´nii, the pingue or rubberweed.
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